Dye some vanilla frosting with yellow decorating icing the color of butter. Frost each cupcake with the dyed yellow frosting. Cut mini marshmallows down the middle, but not completely in half, and place them on top of the cupcakes to completely cover the tops. Spray the marshmallows (while on the cupcakes) with yellow color mist. Place the cupcakes in popcorn boxes.
Spray the yellow mist outside or over the sink so it doesn't go everywhere.